struct Student
{
	char s_sName[20];
	char s_sId[11];
	int s_nAge;
	int s_nClass; 
	int s_nMath;
	int s_nEnglish;
	int s_nChinese;
	int s_nComputer;
	int s_nHistory;
};

int Remove(char a[],int *p,struct Student Stu[]);
void Rank(int Class,int subject,int a[],int length,int *p,struct Student Stu[]);
void ShowMenu();
void Save(int a,struct Student Stu[]);
int SearchID(char a[],struct Student Stu[]);
void SearchInformation(struct Student Stu[]);
void RemoveStudent(int *p,struct Student Stu[]);
void SearchClassRank(int *p,struct Student Stu[]);
void Print(int *p,struct Student Stu[]);
void Modify(struct Student Stu[]); 
void EnterGrade(struct Student Stu[]);
